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GCHQ releases 'most difficult puzzle ever' in honour of Alan Turing | GCHQ | The Guardian

GCHQ releases 'most difficult puzzle ever' in honour of Alan Turing | GCHQ | The Guardian | News from the world - nouvelles du monde | Scoop.it
12 riddles linked to new £50 note featuring the codebreaker may take seven hours to crack
Marco Bertolini's insight:

GCHQ releases what it calls the "most difficult puzzle" ever in honour of Alan Turing and the new 50 pounds banknote with the mathematician's portrait.

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News from the world - nouvelles du monde
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